How do I use a UVmap in renderman for Blender?
The UV maps work the exact same in Renderman as they do in Cycles. However there is something to be aware of. 

You must have the image texture node loaded with the image to view it in the UV editor. (Do not have the node connected to anything just have it in the node editor by itself).

Also make sure you click "convert cycles materials to renderman materials" in the materials tab. (They wont copy exactly but it will get you started).